As you mentioned somewhere else, correlation is not causation.
In addition, you seem to again deny the very existence of the placebo effect, though the reality and the influence of this effect is accepted by both doctors and alternative practitioners. For some examples of the very real placebo effect, refer to this explanation.
Further, you are using a shill tactic (sorry to use this word, but that’s what you’re doing – please allow me to explain). This tactic means that you first mention an existing effect, in this case, the toxicity of “excessive mercury”, as you call it. The goal of such a statement is to sound trustworthy and to nudge your readers into agreeing with you. The trick is that you then continue by saying unproven or even false statements. As the readers are already agreeing with you because you said something that really is true, they almost automatically tend to also agree with the next thing you say – even if that next thing is a lie.
In this case, you start by denying an accepted phenomenon. Then you make people agree with you by saying something that happens to be true. You finish by making an invalid assumption, namely that amalgams cause health problems. You do not tell that if you could just show this statement to be true, you would win a lot of prizes…
I think you’d help people much more by not taking their attention away from the true cause of their problems. Making something up and pretending that something to be the cause of their problems is good for luring innocent victims into your practice, but it won’t help them at all.